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Quiz: Entidades y BD

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Quiz: Entidades y BD

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Preguntas sobre bases de datos y planeación

Created by

MISAEL MATA VAZQUEZ
MISAEL MATA VAZQUEZ
Mexico

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Quiz: Entidades y BD
 

Quiz: Entidades y BDOnline version

Preguntas sobre bases de datos y planeación

by MISAEL MATA VAZQUEZ
1

La cardinalidad de una relación nunca puede ser 1:N; siempre es 1:1 o N:N.

2

Las claves foráneas no pueden existir fuera de una clave primaria.

3

En un modelo entidad-relación, una entidad representa un objeto del mundo real con atributos.

4

La clave primaria identifica de forma única cada registro en una tabla.

5

En la fase de planeación se definen los requerimientos y objetivos del sistema de base de datos.

6

La planificación de datos no afecta al desarrollo de software.

7

Una entidad siempre debe tener al menos 5 atributos.

8

Relaciones entre entidades permiten modelar asociaciones entre objetos del mundo real.

9

La normalización busca reducir la redundancia de datos dividiendo tablas.

10

Un diagrama de entidad-relación solo se usa para bases de datos no relacionales.

 
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